In doing the post mortem on my engine I discovered the A/F ratio with the Pro m was 13.4. Stock mass air was 11.0 Two separate dyno's confirmed those results. The admonishment is to dyno after any Mod that could influence A/F or timing...I learned the lesson the hard way. Is it just my advancing years or can others hear detonation at WOT with the S/C screaming? Sent the Pro M back to Best Products and they recalibrated it. Bet your a$$ I'll be much more careful in the future....Ken

 

Yes. I have had a rolling idle since installed. The first time I shipped it to Best Products they could find no problem and simply replaced the electronics as a precation. I sent it off again today as the rolling idle persists...Sherri told me they have a new program for the electronics! I think everyone should check their air/fuel rations...good luck to nitrous guys at high rpm without an increase in fuel! I actually got a SES (right side lean bank) code! I expect results this time. I am not a happy camper....

 

Oh..I forgot to say..the Pro-M people are very nice! They will work with you! I am confident they will get this resolved! I know quality when I see it

 

Ken, how did you check your a/f? Just curious. I've seen a 99 L dyno with the Pro M and full exhaust and it was about the same a/f ratio as yours. BUT, that was on a relatively cold engine( truck had been sitting for approx. 25 minutes before run). After about 6 or 7 runs without any modification (except for engine heat), it started to richen back up to the low 12's high 11's.
A/F was monitored by wide band O2.

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01 Silver Lightning-no mods yet!
00 S281 Speedster - 312 rwhp 383 rwtq
98 GSXR-750 - 123rwhp

 

i want to see more info on a/f ratios.....anyone using an autotap???

 

Yep, here is a stock run:
http://www.megapathdsl.net/~araja/pics/autotap2.txt

I'll do a run with my R9/airaid...